I think what will occur this time that didn't occur with the Switch is a semi-custom APU. One that won't release in other Nvidia products. I've been saying this from the start. So far, the leaks have confirmed this is likely true. T239 features 8 cores in a cluster vs 4, and will feature just one cluster instead of three. In addition, sources suggest that there will be Lovelace features, so it may be a bit of a hybrid between Ampere and Lovelace.
This means that cross comparisons to other Nvidia products is going to be difficult. For example, many people are looking at the T234 and it's 50W for what we should expect, yet the less clusters you have generally the less power you draw. So they may not have to cut back as much as predicted to get the desired power draw.