No, the two in series will be 24 volt, 74 amp, 1820 watts (even though those numbers don't exactly match up, but close enough).

You can choose one or the other. Series doubles voltage. Parallel doubles amps. You can't double both thus quadrupling power with two units.

If I'm not mistaken the 1420Duo is limited to ~65 amps input. So perhaps a measly 1560 watts of input, a little less of actual charge power. Assuming you have the mains power, might be less on typical US 110-115 AC line power.

Depending on what batteries you are charging and at what amp rate one supply may suffice. And/or the above comments may not apply.