Is there a way to differentiate prostatitis and bph?

Yes. Differentiating prostatitis from BPH is done by clinical history. Other adjunctive studies also assist in the diagnosis as well. These include urinalysis, blood tests, rectal examination, and possible prostate ultrasound.
Yes. The two conditions are actually quite dissimilar. A physical examination and thorough history by urologist or other competent physician should easily differentiate the two.