Probably if you add up the years before Jesus Christ was born (B.C.) and the years after He died (A.D.) it will also come up equivalent to the number in Lao new year. Actually Lao is also celebrating the Mhong new year but Im not sure how many years already.
2552 is not laos new year is came from India who believe in buddha and hindhu mean buddha ( sithatha) born first jesus christ actually buddhism and christian are same ,if you read lao bible you will understand any celemonies or festival like lao new year fire rocket racing board and wedding is all came from hindhu I guess