well, there will be a difference in weight between the two engines, but usually this can be compensated with spring pre-load, re-adjusting the car´s ride height. Now, it seems that your spring preload on your dampers is not adjustable by looking at your pictures. I´d say you could make an improvement and buy a new set of adjustable dampers which allow you to adjust both spring pre-load/ride height and damper resistance. this will be useful not only for the engine change but also for tuning up the suspension further, once the v6 engine is fitted.
I say this because spring rates are not selected according to the weight distribution only. The static weight distribution is the first parameter to consider but only if the car is stationary. When it´s driven, you have weight transfer in acceleration, braking and cornering and this is really what you want to wait and check before making a spring choice to change yours.
rgds.
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