A reflection of shape I across the y-axis, followed by a (blank), and then a translation left 6 units and down 4 units confirms congruence between shape I and shape II.
1. 90-degree clockwise rotation
2.90-degree counterclockwise rotation

Alternatively, a 90-degree counterclockwise rotation
of shape II about the origin, followed by a reflection across the y-axis, and then a translation right 4 units and up 6 units confirms congruence between shape II and shape I.