In my opinion, both of these are authentic. The Brown looks like an earlier version of his autograph and although I found no really close overall matches, the overall letter formation looks similar. The Hope is authentic and it is unlikely that Brown would not be authentic on a dual signed item with a legitimate Hope.
Randy, My thanks for taking a look. Bob Hope was the Grand Marshall at the Winchester Va. Apple orchard shindig back in the day. Also signed on the same page we a couple of Washington D.C. Chanel 7 sports reporters……Keep both as exemplars…..they are real.