I don't know enough about BPE to comment comprehensively on how comparable it is to FPP L1, but Aviva Health's website has the handbook here -
http://www.avivahealth.ie/vivas-files/docs/Business-Plan-X-HB.pdf. From glancing through the comparison on the HIA's website, BPE does seem better, with better access to hi-tech hospitals, better maternity and better out-patient.
Also, the HIA comparison tool will let you do a side by side comparison as follows:
1) Click on Product Comparison on the HIA homepage. This will bring you to the comparison page.
2) Don't enter any parameters and just click ther Search button at the bottom of the page. This will bring up every health insurance product available.
3) Find the two plans, tick the boxes and click Compare. Given the size of the list, the simplest way to find the two you're looking for is to use your brower's Find function (for Internet Explorer, press the Ctrl and F buttons on your keyboard, enter the plan name and press return).
4) After you click Compare it will show the two plans side by side.