No, I don't think your being picky. If you take the effort and pay for the original looking, date-coded hoses, you should get them! Its easier to slap any heater hose on, but it looks like crap, especially when they're RED. LOL
I appreciate original looking Mopars, not perfect, but original in appearance.
That being said, not sure about your 1970, but I went through the trouble to get the correct heater hoses for my 69, (see pic).
My 69 is not with me at the moment so this is the only pic I can find for now. I don't think I got them from MrMoparts. I believe 1 IS ribbed, and the other is clearly stamped.
Hope it helps,
Joe
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