I have never used Oriental Seagull and can make no comment on the comparison as such. But just for future reference, a technique that I learned from John Sexton at a recent workshop for comparing papers is to compare the max black. It is surprisingly effective. John took half sheets of various papers and grossly over-exposed them all (room lights on, REALLY over-exposed) then processed them all normally and placed them all under a normal light for evaluating. When placed side by side, it is really surprising how much difference there is from one paper to another in the depth and shade of black. So even when the texture and apparent exposure and development times seem to be the same, this is one test that will always show a difference if one exists.
Also, as mentioned above, the way the paper tones is another dead giveaway.