2mm roller is it safe/any good?

Hey I ordered a 1.5, mm roller (192 needles) which my cousin picked up for me. Unfortunately it looks like it's 2mm in size. I plan on staying as consistent as possible with the study which saw positive results when lads derma rolled once a week with a 1.5 mm DR. Do you thinks advise me to get the roller replaced or would I be ok with using a 2mm. Any advice on this would be greatly appreciated