I would also say Turn Field and Crown St are different locations. Turn Field appears in 1783 and much later would evolve into Turnfields. In 1921, the owner Arthur Brown, gave it to Thatcham Parish Council to be used as a recreation area for children as it still is along Chapel St. In the 1600s it had been known as Tunfield possibly suggesting it was a round field perhaps coming from the old English, Trun. The recreation area seems only a portion of a former larger area making up Turn Field.
Crown St had earlier been also known as West St and Cheap St. In the 1851 Census, part of it now appears as Crown St, named after the Crown Inn, and Cheap St would fall into disuse. By the latter 1800's it started to become known informally as the High St. West St makes it's reappearance in the 1896 to 1914 electoral registers. At the start of 1928, it was officially now known as High St.
In 1851, a brief check shows Hydes living almost opposite Turn Field on Chapel St. If any of those living in Broad St are yours, today it's The Broadway which adjoins the High St. The 1841 plot numbers around this area ( Broadway/High St) were in the 1200 series numbers.
So, i think at least these two are different places, though not that far from each other.
