Ven. Anālayo, in his Satipaṭṭhāna & Meditation Practice Guide, talks to the clinical terms interoception and proprioception regarding these two types of awareness. He doesn’t explicitly call out the pāli terms but it’s clear he considers proprioception a way to think about sampajānā – “situational” awareness per Bhante Sujato’s translation. At least, I think that’s a fair equivocation.
That is, awareness of how one moves about in space and, for example, not having physical accidents due to distraction.
I also see Bhante’s note for (1.2) Kāyānupassanāiriyāpathapabba:
In early Pali, this practice is found only in the two Satipaṭṭhānasuttas and the closely related Kāyagatāsatisutta (MN 119). It is practiced by developing a reflexive awareness of one’s posture and activity as it proceeds, often assisted by moving slowly and carefully.
So “reflexive awareness” adds more context for mindfulness of the postures (1.2). Maybe there’s more in the commentaries.