Mercury/Redstone/Jupiter?

Reading this webpage:

http://aesp.nasa.okstate.edu/fieldgu...r/mr-ccas.html

It says that unfortunately it was made from a Redstone instead of a
Jupiter C. The Redstone is shorter and gets narrower near the top.
(I can see that too.)

Were the sub-orbital Mercury capsules really launched on Jupiters? If
so, then why were they called Redstones? (I know that Jupiter and
Redstone are basically the same.)

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