It depends on the nature of your variables, and what assumptions you can make about the data. It looks like you have one dependant variable, and one independent variable. Your dependant variables looks like it is continuous, and your independent variable looks nominal.
It seems like an Independent Samples T-test would answer your question. This would tell you if the difference of the means of Y and of X is statistically significant. However, due to your sample size (n=2, and n=4; N=6), you will not have enough statistical power to find any differences that may exist.
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