I tried mixing PCC team leaders with Energon 5-in-1 basics,here's the results. First off: as mentioned before,the PCC team leader connecting peg is bigger than the energon 5-in-1 deluxe sized team leader connecting peg. Second off: the PCC basic sized team leader connecting peg is more square. while the energon 5-in-1 deluxe sized team leaders connecting leg is more rounded off & has more corner. I used the PCC Basic sized Searchlight helicopter toy. I transformers searchlight into his gestalt mode configuration. I used the energon 5-in1 combiner basics from the constructicon toy. You've really got to jam & push & extert extra force. just to get the 4 basics sized energon 5-in-1 combiners connected to searchlight. the end result looks kinda incredible. even though the PCC team leader gestalt has a small gestalt head. NOW ON TO THE REAL PROBLEM. trying to pull out the 4 basics sized energon 5-in-1 combiners is tons harder to attempt than it was to try to attach them on. I actually broke one connecting peg on my PCC searchlight trying to pull a energon 5-in-1 basic off of searchlight. I had to use a tiny phillips screw driver to take apart a energon basic in order to get the peg out of the hole. HONESTLY,If you have no plans of detaching the energon 5-in-1 basics from search light. then I say go for it & try it. If you have plans on attaching & detaching a few times,then I say don't try it. RANDOM SIDE NOT CAUTION: As noted by others & now myself. once you detach/pull out the energon 5-in-1 combiners from the PCC Basic. the 5-in-1 basics round hole will be streched out a bit. causing the energon limbs to connect a bit loosely on the energon 5-in-1 deluxe team leaders connecting peg. Because the pcc Basic teams leaders bigger peg stretches out the hole of the energon 5-in-1 basic in order to connect.