There is no difference in hashrate if you mining with same crypto algorithm. All described above are Ethash, so the hashspeed will be same for all of them. I.e. if you mine Ether with 22Mh/s it will be 22Mh/s at EXP or ETC.
I think you are wrong here. With Different coins being on a different Epoch, coins like UBIQ's Dag File is much lower and smaller. It will have a faster Hashrate than ETH with the higher DAG File which is bigger.
This is why AMD released the Driver optimized for crypto to address the reduced hashrate for larger DAG Files. This only affects AMD cards and not really Nvidia cards.
Even with the new driver there is still a difference in hashrate if you test both coins
Here is a proof (see a link to monitor data below) - you can see the mining pools names. The upper is R9 380 2Gb card running in my desktop and mining EXP. The lower is old rig mixed with different cards. Cards 1,3 and 4 are 4Gb R9 380.
All 380 cards are mining near same speed except first one with Elpida mem (others are Hynix). All mine with blockhain driver
