Samarawickrama shared in a third wicket partnership of 143 runs with Mishara. Mishara fell 2 short of a well-deserved century when he was dismissed by Khurram Shahzad to a catch by Mohammad Haris.
The first test in the 2-match series was also drawn.
The two sides will meet in three ODIs, the first of which commences on November 10 at the Rangiri Dambulla International Stadium.
Pakistan A 394 (106 Overs) RR: 3.71
Sri Lanka A 67 (22.2 Overs) RR: 3.00
(Suminda Lakshan 29, Nipun Dananjaya 17, Naseem Shah 4/28, Khurram Shahzad 3/10, Arshad Iqbal 2/14)
And 317/6 ( 86.4 Overs) RR: 3.65
(Sadeera Samarawickrama n.o. 151, Kamil Mishara 98, Suminda Lakshan 25, Himesh Ramanayake n.o. 4, Khurram Shahzad 2/67)