SyncToy 2.x 64bit and 32bit should act pretty same. For your case even with 2.1 on 64 bit, just if the action setting is same as the previous one, you should get these two folders be synced same as before.
A good practice suggestion is, after you install a new instance of SyncToy 2.1, run preview firstly, then do a check in case there is something wrong.
Thanks,
Ping
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