Both speakers are very inefficient and can present difficult loads, which is not a good combonation with Class D amplifiers like the one inside your Panasonic receiver. The ERA D4 LCR is even worse than the Satelite speaker in relation to the load, so that will be pretty much out of the question for that receiver at this time.
Don't plan on playing either speaker at higher levels without experiancing amplifier clipping with either pair of speakers.
Is there a reason you are looking to get such small speakers, or would it be possible to get larger ones. It is easier to find larger speakers that sound good for the money, IMO.