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Find the Difference

Age 5 to 7 Challenge Level:
Ellie from St Michael's School wrote:

I was thinking before I started, and what I was thinking was I should have the biggest numbers at the bottom. For my first solution, I put a 1 at the top and placed and 3 and 4 in the middle. The 5, 2 and 6 then fit into the bottom. 

Then I tried to put a 2 on the top and had 3 and 5 below in the middle. The 4, 1 and 6 fit into the bottom. 

After that, I tried a 3 at the top and placed 2 and 5 in the middle; 4, 6 and 1 remaining into the bottom line.

Martí from Thau, Barcelona in Spain sent in these:

        2            3             3
        5   3        4  1        5  2
        6   1   4    2  6  5    1  6  4

Nicholas from GSIS in Hong Kong sent in this one:
Kaustab Roy from Vibgyor High in India sent in the following:

I solved find the difference problem. I made four different solutions for the problem and without my parent's help.

Thank you for those solutions, I wonder if that's all there are?