Yes, this would mean that you cannot use TurboTax to claim 2 separate EV credits. The only way you would be able to print and mail, is if you were using the desktop version and you went into forms mode and did the calculations to add the second form. THen you would be able to make the adjustments and then print and mail. You cannot do this in the online version.
You can however, use the CO state site to file your CO return.