Compatibly Pins for PIC

[keithdoxey]

so basically your question is "which pics have 18 pins" because the functionality of those pins can be quite different as can the memory size to shoehorn your program into.

[savnik]

so basically your question is "which pics have 18 pins".

Yes , but one to one.
I have a code for the pic16f84a and if use this code for other pic (16f628 - 16f88) , i change the code (A/D , comparators ,Vref)