How can two data sets have the same power?

How can two data sets have the same power?

I'm doing one-way ANOVA power calculations (in R) for an RCBD trial with
15 groups, 3 blocks, and n = 3 per group. How is it possible that two
different ANOVA models have exactly the same power even if the response
variables are different? Even if the responses are somewhat related, I
don't understand why the power is the same even to 7 significant figures.
The fact that the power is very low makes sense.
Here are the calculations for two possible responses:
groups = 15
n = 3
between.var = 0.3422844
within.var = 1.026853
sig.level = 0.01
power = 0.2162478
groups = 15
n = 3
between.var = 1.759788
within.var = 5.279365
sig.level = 0.01
power = 0.2162478