How can I update 2 separate figures without opening new figures?

When plotting 1 figure, hold on works fine. With two figures, it keeps opening a new window. How can I make 2 figures, and update lines on them?

FREQ = 1:100;

figure()
plot(min(FREQ):max(FREQ), 20*log10(Z))
hold on

figure()
plot(min(FREQ):max(FREQ), 20*log10(ZC))
hold on

Answer 1

[madhan ravi]

figure(1)
...
figure(2)