When were they planted? And where do you live?

They were planted at the end of April. And we live in Northern Virginia.

I’m not 100% sure. The tags with them said they were but one has much darker green leaves. The soil is the same in both spots but I may try fertilizing it and see if that helps.

It will also depend a great deal on planting techniques....did one rootball get more/better massaging than the other, etc. And soils can vary rather widely even in almost identical locations. It may drain faster in one area compared to another.

But regardless, do not expect much in the way of overall growth in less than 2 months in the ground. Root establishment and therefor growth takes the better part of the season, if not longer.

Is one closer to a rain gutter downspout than the other?

looks like 2 different varieties...

New plants rarely need fertilizer, so if you haven’t done that yet, I would resist that temptation unless you have a soil test that indicates a need. For instance, too much nitrogen can leaves you with a lot of leaves but few flowers.