K2543 on 6 Volts

To use this kit with 6 Volt negative earth I must change all the 8 resistors according to the manual.
Strange thing is that I should change R4 for this purpose for a 100 Ohm one, but it is already 100 Ohm.
Does anyone have an idea if this is correct?

Looks like R4 should stay the same.
However you might want to look at the wattage of the one that came with it.
That might be the diffeance

Thanks for your quick answer.
The Wattage seems to be the same, 1/4 W.