Dear all,

I have a specific problem that I don't quite understand how to solve. I have two files, both of the same format:

XXXXXX_FIND1 bla bla bla
bla
bla
bla
bla
bla
bla
bla
bla
bla
========
(return)
XXXXXX_FIND2 bla bla bla
bla
bla
bla
bla
bla
bla
bla
bla
bla
========
(return)
etc...

The problem is that each entry is randomly swapped, for example in file 1 there is XXXXXX_FIND1, XXXXXX_FIND3, XXXXXX_FINDX mixed, as well as in file 2, but scrambled.
What I want to do is create a new file and match entries like:

XXXXXX_FIND1 bla bla bla
bla
bla
bla
bla
bla
bla
bla
bla
bla
========
(return)
XXXXXX_FIND1 bla bla bla
bla
bla
bla
bla
bla
bla
bla
bla
bla
========
(return)
XXXXXX_FIND2 bla bla bla
bla
bla
bla
bla
bla
bla
bla
bla
bla
========
(return)
XXXXXX_FIND2 bla bla bla
bla
bla
bla
bla
bla
bla
bla
bla
bla
========

Note that:
1) I don't know the letters/numbers in FIND1, FIND2 etc. But these match between the files, and they are always five.
2) There are entries that do not match; those should not be considered
3) bla is for information that does not match, and sometimes some entries have more lines of "bla"!

Is this possible to do with bash or awk?

Thank you in advance!