Please don't talk about "acquiring" anything here. It is irrelevant to the question and in our rules it clearly says we are against selling/buying of these products, we support people to extract their own. This way you dont support unscrupulous people using potentially bad methods and unclean chemicals. It is easy enough and safer to extract your own, you will know what you will be getting and the total investment is minimal.
Now back to the original question, yes you need
TLC and/or reagents to tell the difference apart. Ehrlich reagent will react more pink-ish with DMT and more purple-ish with 5-MeO-DMT.
Here is a video where you can see the difference. Though this is on TLC plate the idea is the same even with pure substances. The other reagent in the video, PDMAB-TS, is sold as hofmann reagent by the bunk police.
You can see more reagent videos
here