I believe that is correct. You can use ODS OUTPUT to save the underlying data to a SAS data set, then use PROC COMPARE to show that the values are the same:
data IRIS; set SASHELP.IRIS; where PETALLENGTH < 20;
run;
ods output sgplot =sg1;
proc sgplot data=IRIS;
scatter x=PETALLENGTH y=PETALWIDTH/ jitter jitterwidth=1;
xaxis grid;
yaxis grid;
run;
/* wait 3 seconds, just in case the seed is based on the time */
data _null_;
call sleep(3000);
run;
ods output sgplot =sg2;
proc sgplot data=IRIS;
scatter x=PETALLENGTH y=PETALWIDTH/ jitter jitterwidth=1;
xaxis grid;
yaxis grid;
run;
proc compare base=sg1 compare=sg2;
run;
/* RESULT: No unequal values were found. All values compared are exactly
equal. */
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