According to this CDC chart we have less hospitalizations for the 18-49 group per 100,000 people than the same time last year.
3.6 per 100k ending 7/31/21 compared to 5.1 per 100k 8/1/20. There was less movement and openness this time last year in those numbers, but this year more openness however with vaccines, so perhaps those differences even out with 2020 and the original variant still producing more hospitalizations. But it’s hard to say based on these numbers this variant hits younger people harder than the original variant.
https://gis.cdc.gov/grasp/covidnet/covid19_3.html
Perhaps there is other data that would support it affecting younger people different or harder than the original variant.