Ok, I understand your problem.
The reason for you not able to see the two attributes on your production is that the attribute support for them may not have been created as both fwconntablelimit and fwnumconn do have the attribute ID mapped out of the box. Looking at the Attribute ID you might have manually created these in your test environment.
To verify, open your MIB Tools and look for CHECKPOINT-MIB , click on the MAP tab and under Attribute Support search for both the variables (fwconntablelimit and fwnumconn) . You should find a Attribute ID in your test and it would be empty in your production.
If you like to have the ID mapped in your prod, click on the " create attributes " icon and that should create a attribute ID , after which you should be able to find these variables with attribute ID
Hope this helps