Is there an upgrade path from 256 to 4096 with Multi-DB

I will definitely need the 4096 setup on Multi-DB — but I doubt if I can do it right now — because I am on a reseller server–

When I get to that size — I obviously need to move to the cloud for performance or a dedicated server —-

So — can I start at 256 and then migrate to 4096 — and is that difficult —

or would I be better to stay with one DB until I can move it to the dedicated server or the cloud — then go from 1 db to 4096