no.
test 400 usually involves 175 cyp, 175 enth, 50 prop.
you can also have sust 500 which I've seen at 100 e, 100 c, 100 pp, 100 i, 100 u
So I'll assume it may be done....may be unstable or not, but probably hurts like a mother fucker.
Using the above method of 4 esters I've seen eq at 400mg/ml and deca at 400mg/ml....which breaks the usual convention