Yes. There is no difference in the tooth thickness.
I'm considering a 26 or 28t granny gear for my Shimano 105 Crankset. The crank now has 50, 39 & 30t chainrings. I'm using a 105 triple front derailluer and an Ultegra GS rear derailluer.
I'm using a 10 speed chain, the bike is a 30 speed.
The SG G-26 is the correct 74 BCD, but is discribed as a MTB chainring: http://cgi.ebay.com/Shimano-SG-G-26-...92346847569163
+1 The only differences in 10 speed chains and 9 speed chains are the overall thicknesses. The interior thicknesses are the same.
The only difference in a 10 speed chainring vs a 9 speed chainring is the machining of the chainring to position the teeth. On some 10 speed rings, the smaller chainring is machined to keep the chain closer to the big one.
In practice, this really doesn't make any difference. The differences are too small to notice. You can actually even run a 10 speed chain on a 9 speed rear cluster, and some brands recommend this if you're using a 10-speed chainring with a 9-speed rear cluster.
Ignore the MTB description. Often times that just means it's heavier and likely more durable.
I just read your posts in the other thread. Sounds like your deailleurs should handle that chainring size fine.