EMV has no effect on the rules for capture amounts. It's only an authorization-time feature. There are things you can do with swipe cards that you can't with a chip, but your specific example isn't one of them. For example, you can't display one total on the device and then authorize a different total, such as when the card is swiped while still ringing up the transaction. 1.
For transactions where the capture/settlement amount is different from the authorization amount, those rules are set by the card brands and are more dependent on industry and type of the transaction than how the card is presented.
For example, Visa's says:
A Merchant must submit an Authorization Request for either:
- The final Transaction amount
- A different amount or amounts if the final Transaction amount is not known, and the Merchant or
Transaction type is included in and complies with Table 5-13, Special Authorization Request
Allowances and Requirements
Table 5-13 starts on page 370 and runs for the next six pages, so there's a lot of special cases. But if you aren't one of them, then Visa can fine you if you change the amount, regardless of swipe or chip.
1 Actually, you can, but the bank can see it and is likely to decline. Except in the US where the banks specifically don't care, and in fact encourage this. See QuickChip, for example.