The best way to know is to make a sample. Do it in the original pattern, maybe about 5 or 6" square. Measure it, see how many rows and sts that is, then putting a slipknot where you finished, measure out the yarn it took. Do it in the other pattern, same number of sts and same number of rows. Then measure that one and note if it's the same size square and if you go past the slipknot or finish before it.
sue- knitting heretic