I wish I knew the answer to your question, but I haven't used Seagull for many years ( I gave up on it during one of its withdrawals from the market) and haven't gone back. These days you cannot count on consistency from very many companies. There has obviously been a change, and then another change. This can mean several things, none of which is privy to you and I. The possibilities are that they had to change the chemistry, or they tried a slightly warmer emulsion and decided to go back, or perhaps they have somebody else coat the paper or make it for them. The latter is not uncommon these days.
If you like a slightly warm tone paper that has not changed and looks like it is going to be with us for a long time, I can highly recommend Bergger warm tone fiber. I develop it in a cold tone developer, Dektol, and with or without Selenium toning it is beautiful. Untoned it has a slightly golden undertone and with selenium it runs from warm eggplant to brownish black. Be careful with toning, it tones fast.
Hope this helps,