I'm a dealer of Canton speakers and can help you....
Your dealer is a liar. Period point blank.
The GLE 490.1 vs. 490.2 is mainly cosmetic and has to do with a thiner baffle plate.
There is a very, & I mean very little difference between a few HZ bass extension and a little loudness. So little, in fact, that in a double blind test you couldn't tell the difference even if you went back 10 years. This is per my contacts at Canton, who I just called for you to double check. He said that while he couldn't imagine anyone doing so or recommending it, you couldn't tell the difference even if you used a .1 as the Left & the .2 as a Right in a stereo pair. They are that similar.
Also, as far as your pricing goes, your dealer is a pirate. MSRP on the GLE490.2 is $700 each = $1400 a pair here in the US at least. I don't know where you live, but (roughly) 30% in tax is a little much, wouldn't you say?
If you can't find a reputable dealer near you and you need assistance, PM me and I'll try to help you if I can. The speakers are fabulous and not much different from their Chrono and Ergo lines, which are much much pricier. Good luck and I hope you have a better shopping experience elswhere!