Havent use either, I think that inline advertises correct engine colours so they should be close I would imagine. No experience with POR stuff other than on some construction equipment. I think it works best applied directly to rust, I would prefer to remove it rather than cover. When I did my 77 I found that red oxide primer was no longer available. I used a regular epoxy primer on the underside then had some paint mixed from an original piece of floor to match the red oxide primer. I painted that on top of the epoxy then used a satin clear coat. A bit extreme but it worked. On my 79 I am not going through that much trouble. Eastwood sells a paint called rust encapsulator that is red, its close but a bit more on the orange side than original. I think it all depended on how the original batches were made but I have seen original examples that are anything between red and brown.
