While the data regarding physical bolt-in fitment is generally 95% accurate, the charts often fail to mention the hidden costs (welding, chopping, and electrical) required to make the "easy" swaps actually work.
Subaru EA81/EA82 (early 80s-90s). These are still flat engines, preserving the low center of gravity. The chart highlights that while adapters exist to mate the Subaru to the VW transaxle, the water-cooling system demands a front-mounted radiator, cutting into the trunk—a structural and aesthetic compromise. vw bug engine swap compatibility chart