‘Different’ in what way? Please, I’m curious, I haven’t read either of them and am deciding myself on which one to read, thanks in advance 
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Hi , basically Vimuttimagga differentiate right and wrong concentration whereas Visuddhimagga didnt in which it indicate samadhi by nature is kusala . Then the part describing nimitta in jhana in both texts appears very different . From the structural perspective, there are 38 categories of Kammaṭṭhāna in Vimuttimagga vs Visuddhimagga has 40 categories in which with the adaptation of ten kasiṇa and two arūpa . There are two types of Buddhānussati in Vimuttimagga , in contrast in Visuddhimagga only one type mentioned . There are three categories of Mettā Bhāvanā in Vimuttimagga but just one in Visuddhimagga .
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Ah excellent! Thank you for your detailed answer, I do appreciate it 
, I think I’m leaning more towards reading Vimuttimagga at this point.
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For me especially definition of concentration is different:
Vimuttimagga:
Definition of concentration
Q. What is concentration?
A. “Concentration” means that one has a pure mind, wholly endeavours, has the benefits of calm, etc., and has an upright and undistracted dwelling [of the mind] — this is called “concentration”.
Furthermore, it means that the mind is not swayed by the strong winds of the afflictions. It is like the unflickering flame of a lamp inside a palace.As is said in the Abhidhamma: “That which is steadiness of mind, stationariness,
steadiness, non-perturbedness, undistractedness, non-dissipatedness, calm, right
concentration, the faculty of concentration, the power of concentration — this is
called ‘concentration’.”
Visuddhimagga:
(i) WHAT IS CONCENTRATION? Concentration is of many sorts and has various
aspects. An answer that attempted to cover it all would accomplish neither its
intention nor its purpose and would, besides, lead to distraction; so we shall confine
ourselves to the kind intended here, calling concentration profitable unification of
mind.(ii) IN WHAT SENSE IS IT CONCENTRATION? It is concentration (samádhi) in the sense
of concentrating (samádhána). What is this concentrating? It is the centring (ádhána)
of consciousness and consciousness-concomitants evenly (samaí) and rightly
(sammá) on a single object; placing, is what is meant. [85] So it is the state in virtue
of which consciousness and its concomitants remain evenly and rightly on a single
object, undistracted and unscattered, that should be understood as concentrating.
There is different emphasis. In Vimuttimagga emphasis is on purity of the mind in samadhi practice. In Visuddhimagga, contentration on a single object is emphasised. I think this subtle difference is actually huge when it comes to practice. I personally preffer Vimuttimagga in this regard.
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I have been informed by HKU that The Path of Freedom is currently out of print. I’ll contact Nyanatusita asking him to update me about future developments 
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FYI the PDFs of Nyanatusita’s translation are now actually available on the publisher’s website, which might also help:
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Thank you, I was buying it for a bhikkhu friend. He has the pdf version, but would prefer to read the hard copy.
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I purchased my copy on Amazon by Arahant Upatissa.
The copy I received had all sorts of highlight and writing underneath it but still absolutely worth it. There are many freely available PDFs online. With the differences between the Vimutti/Visuddhi as people are remarking on, the gauge for ‘what is actual’ is ones direct experience by testing what has been presented or seeing if it agrees with ones own reason.
Reap it all!