This isn’t possible, because although the DSP structures are similar they are not compatible. You will need to recreate your configuration by copying parameters by hand. Biquad filter files will need to be recalculated at 48 kHz sample rate so they are compatible. Note that the DDRC-24 plugin does not support the following features that are in the 2x4 HD: user-programmable FIR filters, compressors, PEQ on input channels.