For anyone who might run into this thread looking for substitution for DMC 3841 or any other DMC substitution:
Try: https://cs-pattern.com/dscp.php?substitute=3841
Notice the substitute parameter at end of link.
It'll show you the Chosen color and other matching close to it.
If you're not happy with the solid colors shown, you can try blend 50/50 to get even closer.
I just wrote this substitute tool like a couple days ago and I am excited to share for those who might find it useful.