Mixed compression in replica set

Hey Community,

I’m currently running a single MongoDB 4.2 (upgraded from 3.6 to 4.0 to 4.2) instance that I’d like to replicate to three new instances (and then retire the original one). The original instance is running WT with Snappy, but I’d like to switch to zstd for the new replicas. Is there any gotcha having my replicas run with --wiredTigerCollectionBlockCompressor zstd when the old primary is still on the default (Snappy)? Is there anything else I should watch out for when transitioning from single-node to replica set with the intent of retiring the old primary node?