Will these fit in in our lathe holders

Will either of these fit in the cut off tool holder we have for the big lathe?
https://www.mscdirect.com/product/details/03181609

I don’t understand the terms like P3 “P” Type.I’ll use it to cut off small pieces of Aluminum and Brass.

P types aren’t flat, if you look at the top it is wider and provides a relief for the cutter and the associated geometry.

Will the P type, like the one from Shars, fit in our holder?