Prefilled what? Prefilled Boge of the same ohms? Or prefilled some other kind of carto? Are the physical cartos identical brand and ohms?
If not, then it's not even worth asking. Some cartos have more capacity, loose stuffing, smaller center air channel. Some are fewer ohms (hotter) or just give bigger drags more easily and vaporize the liquid quicker.
If the cartos ARE identical in all ways except you filling vs prefilled, what PG/VG did you fill with? The Boge prefills are standard resistance (3 ohm) and filled with 100% PG
juice.
Or maybe you are just not filling completely? Some new carto users drip juice in and then as soon as a drop comes out the bottom they think they are done. That is not done. The carto has a 1ml capacity. You need to aim towards putting 1ml in. I hold a tissue on the threaded end hole, tilt the carto and drip in 18 drops (waiting longer for the first few to soak in), Then I wait 15 seconds. Then I see how many more it will soak in easily (usually 3-6, occasionally more). Then I clean it up - clean threaded end, tilt open end down into tissue and puff into threaded end to clear the air channel, then while still pointed down I just touch a soft bit of tissue to the top of the stuffing to sop up excess (to help prevent leaks). Then I let the carto settle. I use juices with 20% or less VG so 15-20 minutes of laying it on different sides is plenty of time for every bit of stuffing to get damp.
Some people force more juice in various ways. I don't like the way a carto vapes when overly full.
And even if you use an identical carto type and fill it identically with identical juice, there can be some slight variety of ohms or stuffing density between any 2 cartos. With some crappy brands, even difference in the length of the stuffing inside. Boges seem very consistent but there could still be small differences.