Yes. You only need the v1 info hash. The first thing a v2 client does with a v2 hash is derive the v1 hash from it anyway. In fact it can't connect to v1 client

Yes. You only need the v1 info hash. The first thing a v2 client does with a v2 hash is derive the v1 hash from it anyway. In fact it can't connect to v1 clients until it's done this so prefer v1 unless you have good reason.