Breadcrumb navigation (just a line) instead of mapping on the 130 - you can’t see if the upcoming turns are at a junction or just a bend in the trail. Might be ok, depending on the terrain you’re racing on.
The 130 also has a smaller battery, but that shouldn’t be a problem for XCM. Looking at the @dcrainmaker comparison tool I can’t see much else (although the maps were enough for me to choose the 530!) https://www.dcrainmaker.com/product-comparison-calculator?type=watch&ids=113528%2C97702#results
Might be worth looking at the Wahoo Bolt if you’re not tied to Garmin?