Whether or not you have a problem depends on your application requirements. For one, if the two current sources are identical in design, parallelling two of them will halve the impedance looking back into the source combination. Is that a problem? That's up to you.
i am not trying out practically. By simulation methods it can be done.
we can try this circuit in SPICE.
if it can then we can measure the voltage between two current sources in series.
i want to know the relationship between the currents and volltages in between them.