Excuse me, is the register room the same for the same chip with different pin numbers?

Why not look at the product manual, there will be corresponding introductions in the general product manuals.

Standing on the ST side and thinking, 44 feet, and 144 feet, if the registers are the same, then what do I sell? The same resource must be the same, and different resources have different configurations.

I think if you read the manual a lot, you will find that there is no inevitable connection between registers and pins. For example, 44-pin and 144-pin chips, the registers of their ad collection part may be exactly the same, and their gpio registers are very different. There may be a big difference, so. . . . I suggest you read the chip manual carefully.