Seed restore from one wallet to another Researching about restore walletS using seeds, I have one question: 


I have 1 Jaxx wallet and the seed assigned to it. 
Then, let´s say that I find another wallet that I like more, that supports the same cryptocurrencies that I had in Jaxx and also the same seed protocol (BIP39)


Can I restore my previous wallet (basically, the same cryptocurrencies, amounts, addresses...) in the new wallet, using the seed that Jaxx provided to me?

Then, there is one more question that comes to my mind...If the answer for the first question is "Yes": Can I use two wallets at the same time that use the same seed?
Provided both wallets support BIP39, you should be able to restore a seed from one into another easily.

Using the seed simultaneously on two different wallets is not a problem, since address generation is deterministic.

Note that BIP39 simply defines the seed process. BIP44 defines multiple coin types, BIP32 defines accounts. At a minimum, any seed based wallet must support these three. Most wallets these days support BIP49, BIP84, and BIP141 for segwit compatible addresses of various types. However, not all wallets support these, and even the ones that do might require you to explicitly select the correct address type and path (such as electrum). Make sure that the second wallet you use supports all the features of the first one.