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effect loop on Fender rumble combo

I want to connect rumble's 1k Ohm send(out) to 21k Ohm input on G-Major multieffect unit, and 40 Ohm output on G-Major to 18k Ohm return(in).

Is difference in ohms a problem?

And if send/return on fender combo turned out to be unbalanced will it still work?
 
Here is what I have found so far.

[Invalid or Expired Link Removed]
Input on the g Major 21 kohm 13 kohm
Output 40 kohm

I would look at other effects pedals and see what the input and output is on them. I bet it's in the same range.

From the g Major manual

The analog Input and Output connectors
on the G•Major are balanced 1/4” jacks.
Optimal connection to balanced equipment
is achieved using balanced cables.
However most guitar equipment is NOT
balanced and you will generally have no
problems using standard mono-to-mono
cables as illustrated below.

I am a big time rookie. Maybe this will get someone else to take a look at the question. If not, try and post with a more specific title like "G Major to EFX Loop Fender Combo."
 
Why do you want to use the effects loop? Those things suck, I always run effects straight through the input.

EDIT: Oh, I see it's a rack unit, didn't realize that. Either way though, I wouldn't bother especially on a small combo amp. In my experience combo amp loops aren't helpful in any sort of way.