In theory, there should be no difference ...
The oil filter has no ability to change the rate of contamination generated by the engine. Let's make up some numbers for an example. Perhaps the engine generates 1 gram of soot per 1k miles of use. (it's just an arbitrary number I picked; don't get too excited). In each scenario, the engine would generate 15 grams of contamination. How often you change the oil does not change the rate at which the engine produces the soot and insolubles. The filter, itself, is still exposed to 15k miles in both situations; hence it should be loaded about the same.
Again - more theory ... Soot loading does not change, but soot amalgamation will increase a bit. How much? Who knows? Soot starts out about 4 nm (nano-meters) in size, give or take a bit. That's 100x SMALLER than where even a bypass filter has good efficiency. The anti-agglomerates in the lube should be doing their job, and so it's hard to know how much the loading of soot will increase, specifically in the sizes that matter (sizes that the filter can actually trap). Generally, to experience decent efficiency, you'd have to be 5-10um in size. So a long OCI does not really assure that you're going to be loaded with huge soot particles. Never confuse the percent of soot present with the size of soot present; those are two entirely separate things. Also, PC analysis can help understand, but PCs do NOT tell us about composition; they only speak to size. There are insolubles that are not necessarily harmful that have size; don't forget that. Now, there will always be nuances that after this a tiny bit. But you're soooooooooo far off into the weeds here it really does not matter.
If you really want to know, then you'll have to run some experiements, and then get a lab to accurately measure the weight of trapped contamination. However, you'd have to run 30 samples of each situation, because without knowing the standard deviation, having only a few samples is pitifully too few to declare true knowledge.