Didn't notice the weight really, but I used them a season apart, that being said, I'm almost 100% sure the Rampage is heavier. Don't know about the toebox on next years, probably the same...but get the Krypton Cross or Il Moro with the ID liner and you shouldn't be cold.
Whatever you do, try them on first...if you know the Flexons fit you and the size that does, you're safe ordering the Full Tilt, but otherwise, try to try on all the boots you're considering, hell, these boots might not fit you at all, you may have feet that are wider and need something like the SPK or a Tecnica Vento...and orthodics will play a big role too, if you have pronation or anything, have orthodics made and take them with you to try on boots.