Hi, I'mThewheelshavefellon! Why does my yearly ESA statement not include my SDP payment?

Good morning and hi to all,
 I'm a brand newey to scope and hope I can help and contribute to the scope community,it was recommended by a friend, we all need a bit of help or advice time to time and today it's me, so if anyone could help with my question I'd be very grateful, I've been receiving esa for around 7 years and I'm in the support group, I also receive pip, (both categories) my yearly esa statement for the forthcoming year has arrived, I noticed that unlike other years it hasn't included the severe disability payment, firstly is this payment the same amount for everyone who qualifies and secondly have I missed something about the payment or the eligibility that has changed?
 If you don't mind while I'm here I do have another related question, is the amount of the esa payment alone the same amount again for anyone who qualifies under the above circumstances?
 I'd be grateful for any help please and thanks for reading, I hope any answers might help others too, bye to all and thank you.