Bolt kits.

sometimes the allen heads are easier to get at and sometime they aint (think intake) but as long as you are getting the correct spec (grade) then there should be zero issue.
got links to the kits you are looking at?
Sure thing.
Here are the hex.
https://alloyboltz.com/product/218-pc-sb-mopar-stainless-hex-bolt-kit/
Here are the allen.
https://alloyboltz.com/product/218-pc-sb-mopar-stainless-allen-bolt-kit/