The Abhidhamma definition of manasikāra seems quite nuanced and prescriptive, but even within the scope of the sutta usages, it does appear that there's both a general sense and a specific/functional sense to manasikāra, as per the opening definition provided courtesy of Tilt.
The general application (definition 2) is that which relates to wise or unwise attention, and that is meant in the general sense. That is where (A)yoniso-manasikara fits in.
However there seems to be a more specific/functional (dare I say, proto-Abhidhammic?) sense to the word (as per definition 1), when it is included in the nama
group of functions, even if we were to filter out the components of the definition sourced from Abhidhamma material. "Feeling, perception, volition, contact, and attention—these are called mentality (lit: name)" (MN 9)
That said, they might
well be one and the same... I don't think we should rule that out. When I asked the question however, I was thinking with reference to the more specific/functional interpretation, with manasikāra as part of nama.