I don't have a filament recommendation for you but perhaps you can use https://filamentcolors.xyz/colormatch/ to find a potential candidate.
3DPrinting
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For what it's worth the "Lego Blue" is 0055BF
Which gives several plausible PLAs and a PETG, but no ABS sadly.
Ah ha! We have a winner.
Looks like the filters get defaulted to pla and petg, and a lot of vendors dont make the default cut when following the link, but there are several matching options for abs and asa.
Yeah couldn't figure out how to add the filters to the URL. But yeah there are some promising ABS/ASA options!
Using RGB values for physical colors in not ideal…
I've used this for making wall prints that don't stand out against the paint. It's quite handy