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JF17 uses RD93(Russian engine)...a Chinese equivalent that can be used on JF17 is the WS13.Don't they have the Wz family of engines?
WS13 has also been used to power the initial FC31 prototypes...and for the future WS19 engine is under development...that is supposed to have a higher thrust.
In short...these engines below are of similar size.
RD93 --- WS13 ---------> WS19
J10 on the other hand has a bigger engine(bigger in size...and in power). Originally it used to have AL31(Russian engine). Then China switched to using WS10 engine for its J10s. If reports are correct...then the J20 jet(which also used AL31 initially) is also using WS10 engine now rather than AL31 engine. WS15 engine is under development for J20(which is currently using WS10 engine)...WS15 is going to be similarly sized to WS10...but is going to have a higher thrust. In short...these engines below are of similar size.
AL31 --- WS10 ---------> WS15
engines colored yellow...are of Russian origin.
engines colored red are Chinese origin. The ones that are italicized are newer gen engines with higher thrust...and are currently under development.