I bought a set just like this but for a 12x12 last year and built it up to a 4’x12’ with 3 varying heights and had a great harvest for two seasons with it. 

I had four posts and some boards leftover so I wanted to buy another set and do another 12x4 with those and this one but couldn’t find the Greene’s brand. Seeing this, I thought Greene’s sold to Electa or something. They’re not exactly the same. Same material however the boards are thinner and corner posts a bit smaller so it’s ruined my plans entirely and not sure what to do.