It would be more dependent on switching brands/types of rocker than the ratio itself. If the adj. screws have the same end(ball vs cup), You shouldn't need to change the
pushrods, but here's a couple of things to keep in mind;
1)the stress on the pushrod goes up some w/the higher ratio, say 30# on a spring that's 300# over the nose
2)the pushrod will move closer to the block/heads, if You're using something beefy it likely will need clearance made
3)valve to piston clearance priority #1, retainer to valve seal/guide height #2, are the springs You're using barely getting the job done now & how far from coil bind #3
4)the sweep will change slightly wider even if both rocker geometries are spot on due to more travel(lift), again more to do with brand/design change than ratio itself.