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You are correct, it isn't in the same league (if its actually even for sale), it's likely the only (mostly intact) one whereas there are an estimated 100+ of the blankets.
Edit: actually, having now read the the link you provided, Yes, it's had some repairs and alterations, but it's rare, much rarer (and older) then any of the 1800's blankets being sold. I don't doubt that sold to the right collector it could be worth 7 figures.
Some full color pictures would be nice and i'm waiting on those from the OP.
We can debate it's "value" until the cows come home, the truth is, no one can know until it actually goes up for auction and sells. The blanket that went for 1.8 million was originally only estimated to fetch around 200,000, but you get a few wealthy private collectors bidding against each other and things can go up real quick!