From what I've heard the Asphalt originated in Canada and the Gravel here in the US. From the visual combos I'd say a Pastel Freeway (YB+Asphalt) has more of an electric pattern with more of a brighter white background vs. a Pastel Highway (YB+Gravel).
I actually just came across an interesting combo on Morphmarket, they are listing it as a Pastel Asphalt Gravel. It's the first time I've ever seen the two combined. It almost looks Axanthic to me, much different than a Super Gravel or Super Asphalt or Highway or Freeway. So yes, very similar morphs coming from different lines but you can tell them apart in some cases and they appear to be compatible with each other.
Pastel Asphalt Gravel:
https://www.morphmarket.com/us/c/rep...pythons/116181
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