Why SAT Scores are always lower than ACT

Applying to College
1

When you convert for instance the 25th percentile of the SAT to the ACT,will always find a lower score that noted on the common data set.

Does it mean that the SAT is easier and admissions convert ACT scores to SAT scores,or something else ?

2

For the instance,in the sdsu common data set: https://asir.sdsu.edu/Documents/CommonDataSets/CDS_2017-2018.pdf
,you can see that the 25th percentile Sat total is 1090(=21 when you convert it to the ACT),but I see below that the 25th percentile ACT is 23. What does it really mean ?
If I only passed the ACT with a 22,does it mean I am above/below of the ACT/SAT range of admissions ?

3

Nobody’s here to answer ?

4

It indicates that the College Board’s 2016 concordance table is likely inaccurate. The 2016 table is based only on percentiles from a College Board 2015 research study. Since that time, College Board has reported different percentiles, for example. Apparently, percentiles are not a rigorous method for creating a concordance.

ACT and College Board are jointly developing a new concordance table to be published this summer.

5

Ah ok. So I should better look my chances at the different ACT scores than trying to convert my ACT to SAT ?