Bitcoin Cash: difference between addresses My BCH wallet prefixes the addresses with a "bitcoincash:" string and the hash itself (without the prefix) is 42 chars. Let's say I need to send some BCH to an old address (34 chars, unprefixed), will this work? If not, what do I need to do to make it work?
Yes.

If your wallet does not support this, you can use https://cashaddr.bitcoincash.org to convert the old addresses to new addresses, and send to new addresses.