An assignment requiring comparison between two numbers using recursion and without using structured objects is throwing me off because I cannot seem to simultaneously compare the numbers and keep track of how many numbers match.

def dm(n1, n2):
    from decimal import getcontext, Decimal, ROUND_DOWN
    if n1<0 or n2<0:
        raise ValueError
    elif n1//10 <1 or n2//10 <1:
        n1v2, c,  n2v2 = round(n1)%10, float(Decimal(n1)-Decimal(n1).quantize(Decimal(1.), rounding=ROUND_DOWN)), n2%10
        if n1v2 == n2v2:
            return int((c+.01) * 100)
        elif c!= 0:
            return int(c)*100
        else:
            return 0
    elif type(n1) == float:
        getcontext().rounding = ROUND_DOWN
        n1v2, c,  n2v2 = round(n1)%10, Decimal(n1)-Decimal(n1).quantize(Decimal(1.), rounding=ROUND_DOWN), n2%10
        if n1v2 == n2v2:
            dm(n1//10+(float(c)+.01), n2//10)
        else:
            dm(n1//10, n2//10)
    else:
        n1v2, n2v2 = n1%10, n2%10
        if n1v2 == n2v2:
            dm(float(n1//10+.01), n2//10)
        else:
            dm(float(n1//10), n2//10)