I don't think these aircraft are from JG5. American personnel controlled the southern sector of Germany, which is where these (and many other JG301) aircraft were found.
The "reversed" JG301 bands are well known, no one is really sure which way round is the "right" way.
Take a look at
http://www.stormbirds.net/experten/yellow15.htm and
http://www.stormbirds.net/experten/p...2addendum1.htm for further details.
Hope this helps,
Chris