There are similarities, but the crucial difference is Ireland only have one professional competitor for talent in soccer, and it's not that close in terms of the athletes they are looking for. As popular as GAA is it's not going to dump money into pathways and talent acquisition in contest with Rugby in the way that AFL and NRL in particular do here. That's a much bigger challenge here, but there are also opportunities it presents in terms of multi-skilled athletes and cross-pollination of ideas at a high performance level that we already don't take enough advantage of.
At the end of the day it's the combination of all those factors I listed (and geography/geopolitical circumstances which I missed) that make it so significantly different. Any one of them on their own probably wouldn't shift the needle much, which might be part of the reason Scotland have chased Nucifora so hard - their circumstances are much closer to Ireland's than ours.