I have no idea what the difference is with those two but I can tell you that my cousin did not like the quality of the one he got from jc whitney for his 1970 T/A last year. He finally broke out the crowbar and opened his wallet and got a new dash from justdashes in california.
http://www.justdashes.com/index_home.htm
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John
"There are no stupid questions, but there are a LOT of inquisitive idiots!"