I never used AVR ATmega before, but now I'm interested on this line, particularly on use ATmega1284P as an optional replacement for PIC16F887 in one of my projects: an Open Hardware PLC for educative purposes that can be builded and mounted by students (it will be publicly available on april 2019).

I want to develop an adapter that allow an easy replacement, simply extracting the PICF887 from its socket and inserting the adapter with an ATmega1284P on board (or a 324P/644P with the same pinout).

In my country is very difficult to find these microcontrollers in PDIP 40 pins package, wholesalers and importers are not interested in market them in this format.
In the other hand, there are a few importers that habitually have ATmega 1284P TQFP 44 pins in stock.

LDmicro have settings, definitions and compile code for ATmega 164/324/644/1284(P) PDIP 40 pins, but not for its corresponding in TQFP 44 pins packages.

May be a silly question:
Can I use ATmega 164/324/644/1284 PDIP 40 pins settings, to compile code for TQFP 44 pins?

If YES:
I suppose that pin assignation for TQFP 44 pins in LDmicro variables table, using 40 pins settings, must be stated based on PIN FUNCTION (PXx), NOT on PIN NUMBER on MCU; I'm right?

If NOT:
Are there a LDmicro developer / power user interested on generate TQFP 44 pins definitions for these microcontrollers?

I can not to do this task by myself: I don't know nothing on LDmicro internals nor on how to properly edit mcutable.h; I don't use MS Windows at all (I run LDmicro on GNU/Linux under wine), so I have not MS Visual Studio nor MS VisualC++, neither Linux equivalent app; I'm not experienced in C/C++ programming.

Yours kindly replies will be welcome!
Best regards,

DanielH