explained all similarities >3

strings/00A54591

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+$00 + LDA $45 + STA (zeropage addres does not match), Y
+
+Instruction + some parts. Trivial - not copyrightable.

strings/4241534943

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+'BASIC' in PETSCII
+
+Programming language name. Not copyrightable.

strings/48A94648

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+PHA + LDA #$46 + PHA
+
+Pushing return address to stack (one byte matched by accident). Not creative - not copyrightable.
+

strings/490FDAA2A5

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+2*PI mantissa + LDA (zeropage address does not match)
+ 
+Part of widely used floating point constant (which is generated automatically) + a part of instruction - not creative, not copyrightable.
+

strings/60A9802CA9

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+RTS + LDA #$80 + BIT (to skip 2 bytes) + LDA (value does not match)
+
+Routine starting with .A loaded with one of 2 values, depending on entrance address. Common technique on 6502. Not creative - not copyrightable.