I have done it that way, and it worked out. I don't know if there's any hard and fast rule about how much of a gauge difference equals a size difference, though. Once you've got it going, measure it and see if it's going to work.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry