which statistic test should I use

Hello, I have a problem in picking the right statistic test in my case. I have analyzed the microbial community in one sample with different methods, and got the community composition for each microbe(e.g. method 1: A 10%, B 20%, C 30%, D 40%; method 2:A 8%, B 15%, C 40%, D 37%). On the other hand, I used a metabolic model to simulate what happened in the sample, and from the model, I got a predicted community composition(e.g. A 12%, B 30, C 25%, D 33%). What I also know is that according to the literature the model has an max deviation of 20%. Now I want to compare these two results to see if the model results are consistent to my observations. I wonder which statistic test should I use? Thanks.