REPLACE 2 different sets of variables?

I am currently using:

=IF((K2="Use Landing Page URL Generator Tool"),"Use Landing Page URL Generator Tool",(REPLACE(K2,FIND("XXXX",K2),4,A2)))

For amongst other things, to replace the variable 'XXXX' if the website that is in the cell next to the formula has 'XXXX' in it. It replaced this 'XXXX' with a 6 digit number from a list I have somewhere in the sheet.

How would I add to this formula if I wanted to ALSO replace another variable like 'VVVV' if it showed up in the URL?

The URL I have been using is:

http://www._________________________...x?keycode=XXXX

XXXX has been successfully getting replaced with a 6 digit number.

Now the URL is going to be changed to:

http://www._________________________...e=XXXX&vd=VVVV

What do I add so that XXXX is replaced with the one column of numbers and the VVVV will also be replaced with the separate column of different numbers I have?

Hmm... this gives me a #VALUE!.

Would a AND function be used here?

Its simple logically what I want to do... just replace XXXX in the URL with one column of numbers and VVVV in that same URL with a second column of numbers.

Tough to figure out though...