Cardio Eliptical and Treadmill?

Is doing 30 minutes of the Eliptical and 30 mins on the treadmill just as effective as 1 hr on the treadmill? I am asking because I have lost 45lbs so far and I truly think my body knows all my patterns now so now i need to come up wit a completely new pattern. I usually do 1 hr of cardio Mon-Fri with leg press on T-TH. I then started alternating that every 2 weeks. Now my new plan is to do 30 mins of eliptical then 30 minutes of treadmil Mon,Wed,Fri then on T-Th only weight train & rest Sats and Suns like normal. But overall my question is would my cardio portion be just as effective if I split it up between the treadmill and eliptical vs just running/walking on the treadmill for an hr?