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Excel 32bit to 64bit

What are the challenges in converting excel applications written in 32 bit version to 64bit version
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In VBA 7, 64 but version we are using pointer particularly in win api calls
Such as LongPtr
Can you please explain why it’s being used in place of long (I understand the 8byte memory space) but can’t that be achieved with LongLong.
What is the exact difference please
Another question I have is about MS activeX control reference
I understand that the library is different for 64bit version
So simple update when I move to 64 bit version
But what I want 32 bit compatible application