Hi asafok,
If you want use a same color for both plots, you can use scripts
plotxy iy:=(3,10:11) plot:=201 ogl:=<new template:=scatter>;
doc -e d {set %C -c 2;};
if want the plots increment from red, you can use scripts:
plotxy iy:=(3,10:11) plot:=201 color:=2 ogl:=<new template:=scatter>;
In either case, we suggest you specify the matching template to be used in the script ogl:=<new template:=scatter>
And "color" option is basically useful only when it is a single plot.