Are Erythematous and Erythrodermic psoriasis the same thing?

At the age of 81 I am a newcomer to psoriasis. I was referred to Dermatology by my GP but got a letter stating that no appointments are available due to "slot availability issues" but they are "consulting with the consultants to arrange more clinics". I decided that I would have to fund a private consultation which happened in 3 days! The diagnosis is "Erythematous psoriasis which "Dr Google" converts to Erythrodermic psoriasis. Can anyone tell me if they really are the same thing? I can find no mention of erythematous psoriasis. Thanks in advance for any words of wisdom!