How could the purple punches catch up? (Day 36 from seed)

Can raise lower plants or do 2 different levels one side higher one side lower but light won't be as strong on lower plants. So best bet is raise the other two. When they stretch they will change size a lot

With very different plants SCROG could be difficult. I would raise the short ones by placing them on bricks which will help in the short term. The problem comes when they flower and stretch. The Mimosa may stretch and again be taller than the Purple Punch. I would do some low stress training (LST) on the taller plants to try and keep them under control but it looks like your Mimosa are already touching the sides of the tent so your already getting limited in how much you can spread them out. You may have to keep raising the Purple Punch higher and higher to keep the tops the same as the Mimosa. In a perfect world I would put the different types in different tents or go LST instead of SCROG so you don't have a net in the way as you try to raise the shorter plants.