No visible difference. Apk 64 bit work on latest Android versions, apk 32 in all Andrid versions.

But:

"The last useful term for updating applications v7a to the 64-bit system is the August 2021. From that moment, all applications developed in 32-bit will no longer work on both new generation and old generation smartphones. The announcement comes directly from Google, which had long since decided the end date of support for apps with this encoding and which now reaffirms with the desire to improve the performance of its operating system and clearly of everything that revolves around it. The transition to 64-bit applications will allow not only better performance with the most current CPUs but also greater security for users who use them."

@Basilas

Same fixes of previous ones.