Should I redownload apps for 64bit version?

I had x32 phone now i have x64.I have apks from old phone.
I can install apks (converted downloaded apps to apk using "ESFileExplorer") from old phone but, should I re-download all apps again for 64bit version?
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Q1 - When I download a app from google play store does it download app for "specific device"(or something) or the apk contains all the stuff?
Q2 - "Specific device"(in Q1) - Does it only depends...

Should I redownload apps for 64bit version?

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