IIRC The LED6 is the only dixmor timer that will do count up cash if you use crptopay
LED 7 Counts up cash with Cryptopay.
This may be a recent change - as of June 2019 only the LED6 could count up in cash. I'm not sure I like that feature anyway.
Other than that, they have the same functionality. I'd recommend the LED6 for retrofit into Coleman equipment because you only have to change the bracket.
FWIW I've had a lot of trouble with LED6 displays. I built a lot of Cryptopay upgrade
doors between 2015 and 2019, and a lot of them requested the 6. About 1/4 of them had display issues and had to go back under warranty, or are still flickering or missing a row or a couple columns or some dots. I've never had an issue with a 7 display that didn't take more than five years to manifest, and they still fixed them under warranty. This has been like two timers out of many hundreds I've sold or installed in new equipment.